Configuring Multiple NICs

Discussion in 'Windows Networking' started by David B, May 11, 2005.

  1. David B

    David B Guest

    Windows Server 2003 Enterprise
    Dell Power Edge 6600

    We have a server, which has multiple NICs in it. We assigned each card an IP
    address ( and Now, we see errors in our system
    event log:

    A duplicate name has been detected on the TCP network. The IP address of
    the machine that sent the message is in the data. Use nbtstat -n in a command
    window to see which name is in the Conflict state.

    Obviously, we've mis-configured something. Our goal is for the 2 NICs to
    load balance on the network.

    Someone told me that I should only have 1 IP, and the two cards should be
    bonded to that single address, however they could not tell me how to do so.

    What am I missing in the configuration of this system?
    David B, May 11, 2005
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  2. David B

    Neteng Guest

    There is special NIC software that should be bonding your NIC's (such as
    Intel), what kind of NIC's do you have? The error is because you have two
    NIC's on one machine in one subnet.
    Neteng, May 11, 2005
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  3. David B

    David B Guest

    They are Broadcom NetXtreme Gigabit. They are actually both onboard on the
    Dell PE6600.
    David B, May 11, 2005
  4. David B

    Neteng Guest

    you'll have to go out to Dells site and download the software. If you dont
    see any software go to Broadcom and verify those NIC's can be bonded and
    they should have software as well.
    Neteng, May 11, 2005
  5. HP makes some.
    I think they have to be identical Nics (little unsure). The Nics will come
    with whatever proprietary software they need to do the job. Some of those
    multiport nics (single card with more than one port, often 4) may have the
    ability and come with software, you'll have to verify that with whatever you
    get. We have one of those type of Nics here but we don't use it in the way
    you are asking,...each port is a different subnet with it.

    But trying to do it with a pair of mis-matched Nics that just "happen" to be
    in the machine,...I doubt you would have much luck. This article describes
    what you will typically get with that:

    175767 - Expected Behavior of Multiple Adapters on Same Network;EN-US;175767
    Phillip Windell, May 11, 2005
  6. This is normal behaviour. It is because netbios is enabled on both
    interfaces and this causes the machine name to be broadcast twice thereby
    leading to the error. Old problem with a old solution. Disable the netbios
    binding on one of the cards.

    Adapter teaming in recommended and the software is on the broadcom cd that
    came with the server.
    Joshua Bolton, May 13, 2005
  7. David B

    Kent Hanson Guest

    Sorry to break into you thread but is teaming ok in a win2003 exchange 2003
    clustered environment?

    Kent Hanson
    Kent Hanson, May 18, 2005
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